<!DOCTYPE html>
<html lang="en-US">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title>面试官：说说你对slot的理解？slot使用场景有哪些？ | 前端档案</title>
    <meta name="generator" content="VuePress 1.8.2">
    <link rel="icon" href="/favicon.ico">
    <meta name="description" content="前端通关宝典">
    <meta name="theme-color" content="#3eaf7c">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    
    <link rel="preload" href="/assets/css/0.styles.e02fc531.css" as="style"><link rel="preload" href="/assets/js/app.bf44e39b.js" as="script"><link rel="preload" href="/assets/js/2.db7a59af.js" as="script"><link rel="preload" href="/assets/js/232.42df48c8.js" as="script"><link rel="prefetch" href="/assets/js/10.3bbe2f24.js"><link rel="prefetch" href="/assets/js/100.43061c81.js"><link rel="prefetch" href="/assets/js/101.2e8a188c.js"><link rel="prefetch" href="/assets/js/102.3f4f14f0.js"><link rel="prefetch" href="/assets/js/103.5ed45f48.js"><link rel="prefetch" href="/assets/js/104.29ef9283.js"><link rel="prefetch" href="/assets/js/105.e4051d70.js"><link rel="prefetch" href="/assets/js/106.ec073f00.js"><link rel="prefetch" href="/assets/js/107.9b165150.js"><link rel="prefetch" href="/assets/js/108.c0031864.js"><link rel="prefetch" href="/assets/js/109.06bb75a7.js"><link rel="prefetch" href="/assets/js/11.402e3434.js"><link rel="prefetch" href="/assets/js/110.edc92528.js"><link rel="prefetch" href="/assets/js/111.e50e0cca.js"><link rel="prefetch" href="/assets/js/112.b0decdf4.js"><link rel="prefetch" href="/assets/js/113.f0801886.js"><link rel="prefetch" href="/assets/js/114.25ab8fa4.js"><link rel="prefetch" href="/assets/js/115.36fc62f3.js"><link rel="prefetch" href="/assets/js/116.8df9a6aa.js"><link rel="prefetch" href="/assets/js/117.1ec0fada.js"><link rel="prefetch" href="/assets/js/118.51c54869.js"><link rel="prefetch" href="/assets/js/119.d708669d.js"><link rel="prefetch" href="/assets/js/12.eba9a66a.js"><link rel="prefetch" href="/assets/js/120.a44efeea.js"><link rel="prefetch" href="/assets/js/121.581a4ae4.js"><link rel="prefetch" href="/assets/js/122.e54e19e1.js"><link rel="prefetch" href="/assets/js/123.62aa41d0.js"><link rel="prefetch" href="/assets/js/124.c51c6b7f.js"><link rel="prefetch" href="/assets/js/125.68055811.js"><link rel="prefetch" href="/assets/js/126.8b16d246.js"><link rel="prefetch" href="/assets/js/127.fc7608d6.js"><link rel="prefetch" href="/assets/js/128.0df431fc.js"><link rel="prefetch" href="/assets/js/129.77241cfd.js"><link rel="prefetch" href="/assets/js/13.a3e65817.js"><link rel="prefetch" href="/assets/js/130.2bf0b622.js"><link rel="prefetch" href="/assets/js/131.77da1093.js"><link rel="prefetch" href="/assets/js/132.c1ac84bc.js"><link rel="prefetch" href="/assets/js/133.001af559.js"><link rel="prefetch" href="/assets/js/134.98ff69db.js"><link rel="prefetch" href="/assets/js/135.b91963f4.js"><link rel="prefetch" href="/assets/js/136.e3df531a.js"><link rel="prefetch" href="/assets/js/137.157c5a5f.js"><link rel="prefetch" href="/assets/js/138.1d3a1791.js"><link rel="prefetch" href="/assets/js/139.9e17df54.js"><link rel="prefetch" href="/assets/js/14.bd9cc5f8.js"><link rel="prefetch" href="/assets/js/140.22839840.js"><link rel="prefetch" href="/assets/js/141.dbde614d.js"><link rel="prefetch" href="/assets/js/142.5a6858ba.js"><link rel="prefetch" href="/assets/js/143.e26d707c.js"><link rel="prefetch" href="/assets/js/144.5b1fbe13.js"><link rel="prefetch" href="/assets/js/145.09921e20.js"><link rel="prefetch" href="/assets/js/146.8ea606b7.js"><link rel="prefetch" href="/assets/js/147.41bda9d5.js"><link rel="prefetch" href="/assets/js/148.d89f18bc.js"><link rel="prefetch" href="/assets/js/149.16aa39c9.js"><link rel="prefetch" href="/assets/js/15.deb2f25a.js"><link rel="prefetch" href="/assets/js/150.07798494.js"><link rel="prefetch" href="/assets/js/151.6732ee94.js"><link rel="prefetch" href="/assets/js/152.c644167e.js"><link rel="prefetch" href="/assets/js/153.040f256b.js"><link rel="prefetch" href="/assets/js/154.1cec3035.js"><link rel="prefetch" href="/assets/js/155.a4b51a17.js"><link rel="prefetch" href="/assets/js/156.095b78e0.js"><link rel="prefetch" href="/assets/js/157.eb262a26.js"><link rel="prefetch" href="/assets/js/158.35756e8c.js"><link rel="prefetch" href="/assets/js/159.6ac43664.js"><link rel="prefetch" href="/assets/js/16.c7b17381.js"><link rel="prefetch" href="/assets/js/160.0a56c40c.js"><link rel="prefetch" href="/assets/js/161.8320b48a.js"><link rel="prefetch" href="/assets/js/162.09ba1172.js"><link rel="prefetch" href="/assets/js/163.f7fb82e8.js"><link rel="prefetch" href="/assets/js/164.ab9df42b.js"><link rel="prefetch" href="/assets/js/165.f012858f.js"><link rel="prefetch" href="/assets/js/166.b3f190e3.js"><link rel="prefetch" href="/assets/js/167.43b66e59.js"><link rel="prefetch" href="/assets/js/168.4eb162d3.js"><link rel="prefetch" href="/assets/js/169.0375d2cf.js"><link rel="prefetch" href="/assets/js/17.da61c942.js"><link rel="prefetch" href="/assets/js/170.90c9c235.js"><link rel="prefetch" href="/assets/js/171.672fc257.js"><link rel="prefetch" href="/assets/js/172.dfa9d8d9.js"><link rel="prefetch" href="/assets/js/173.61a6ec8e.js"><link rel="prefetch" href="/assets/js/174.4f4ef0d7.js"><link rel="prefetch" href="/assets/js/175.675d01d1.js"><link rel="prefetch" href="/assets/js/176.5bd1bcb7.js"><link rel="prefetch" href="/assets/js/177.4355dadd.js"><link rel="prefetch" href="/assets/js/178.79ed29b8.js"><link rel="prefetch" href="/assets/js/179.2247dc30.js"><link rel="prefetch" href="/assets/js/18.6e554767.js"><link rel="prefetch" href="/assets/js/180.db79361a.js"><link rel="prefetch" href="/assets/js/181.85a33295.js"><link rel="prefetch" href="/assets/js/182.0bc317bc.js"><link rel="prefetch" href="/assets/js/183.7769a38e.js"><link rel="prefetch" href="/assets/js/184.9b0aba05.js"><link rel="prefetch" href="/assets/js/185.f6dc87bd.js"><link rel="prefetch" href="/assets/js/186.e3b7de00.js"><link rel="prefetch" href="/assets/js/187.a6dadcea.js"><link rel="prefetch" href="/assets/js/188.d3f8b0e3.js"><link rel="prefetch" href="/assets/js/189.1112499f.js"><link rel="prefetch" href="/assets/js/19.f800e0d1.js"><link rel="prefetch" href="/assets/js/190.e3255e84.js"><link rel="prefetch" href="/assets/js/191.34deece6.js"><link rel="prefetch" href="/assets/js/192.69821c0e.js"><link rel="prefetch" href="/assets/js/193.769a5088.js"><link rel="prefetch" href="/assets/js/194.afaa2cde.js"><link rel="prefetch" href="/assets/js/195.5b94bbc6.js"><link rel="prefetch" href="/assets/js/196.3b078264.js"><link rel="prefetch" href="/assets/js/197.2d9585d3.js"><link rel="prefetch" href="/assets/js/198.3095d8b8.js"><link rel="prefetch" href="/assets/js/199.79b6db11.js"><link rel="prefetch" href="/assets/js/20.4a74a968.js"><link rel="prefetch" href="/assets/js/200.c309ef7a.js"><link rel="prefetch" href="/assets/js/201.bded46e8.js"><link rel="prefetch" href="/assets/js/202.801fb3ea.js"><link rel="prefetch" href="/assets/js/203.b9933f5e.js"><link rel="prefetch" href="/assets/js/204.255b43df.js"><link rel="prefetch" href="/assets/js/205.000fb7ac.js"><link rel="prefetch" href="/assets/js/206.8f945829.js"><link rel="prefetch" href="/assets/js/207.74942b2e.js"><link rel="prefetch" href="/assets/js/208.329d8230.js"><link rel="prefetch" href="/assets/js/209.3fc54586.js"><link rel="prefetch" href="/assets/js/21.5f725cbd.js"><link rel="prefetch" href="/assets/js/210.1aa9659f.js"><link rel="prefetch" href="/assets/js/211.702df03f.js"><link rel="prefetch" href="/assets/js/212.ca95f208.js"><link rel="prefetch" href="/assets/js/213.024b4fa6.js"><link rel="prefetch" href="/assets/js/214.e2830dd8.js"><link rel="prefetch" href="/assets/js/215.0b646cb4.js"><link rel="prefetch" href="/assets/js/216.9bd6d019.js"><link rel="prefetch" href="/assets/js/217.586593b4.js"><link rel="prefetch" href="/assets/js/218.a2244829.js"><link rel="prefetch" href="/assets/js/219.1d858220.js"><link rel="prefetch" href="/assets/js/22.7d2b7a74.js"><link rel="prefetch" href="/assets/js/220.7f5e3dbd.js"><link rel="prefetch" href="/assets/js/221.d1f79d31.js"><link rel="prefetch" href="/assets/js/222.51d8a12c.js"><link rel="prefetch" href="/assets/js/223.797028ea.js"><link rel="prefetch" href="/assets/js/224.d925bf8b.js"><link rel="prefetch" href="/assets/js/225.cfe12606.js"><link rel="prefetch" href="/assets/js/226.b6bd41b4.js"><link rel="prefetch" href="/assets/js/227.15412d16.js"><link rel="prefetch" href="/assets/js/228.66af5157.js"><link rel="prefetch" href="/assets/js/229.cfb11559.js"><link rel="prefetch" href="/assets/js/23.1409c9f4.js"><link rel="prefetch" href="/assets/js/230.d2e613b5.js"><link rel="prefetch" href="/assets/js/231.85b8958b.js"><link rel="prefetch" href="/assets/js/233.d3be0c78.js"><link rel="prefetch" href="/assets/js/234.bb68d0be.js"><link rel="prefetch" href="/assets/js/235.bfd00052.js"><link rel="prefetch" href="/assets/js/236.3d58cc9d.js"><link rel="prefetch" href="/assets/js/237.d9af6062.js"><link rel="prefetch" href="/assets/js/238.54894974.js"><link rel="prefetch" href="/assets/js/239.b69669d0.js"><link rel="prefetch" href="/assets/js/24.e06b2b32.js"><link rel="prefetch" href="/assets/js/240.44f7b333.js"><link rel="prefetch" href="/assets/js/241.2d307b1a.js"><link rel="prefetch" href="/assets/js/242.47aecf42.js"><link rel="prefetch" href="/assets/js/243.b5afbb6e.js"><link rel="prefetch" href="/assets/js/244.8e04094f.js"><link rel="prefetch" href="/assets/js/245.78009475.js"><link rel="prefetch" href="/assets/js/246.eb7991c2.js"><link rel="prefetch" href="/assets/js/247.00c024fd.js"><link rel="prefetch" href="/assets/js/248.144c2842.js"><link rel="prefetch" href="/assets/js/249.35bae652.js"><link rel="prefetch" href="/assets/js/25.5e7aeaa8.js"><link rel="prefetch" href="/assets/js/250.854bde18.js"><link rel="prefetch" href="/assets/js/251.7cbb77f8.js"><link rel="prefetch" href="/assets/js/252.1ed96448.js"><link rel="prefetch" href="/assets/js/253.9d736b7d.js"><link rel="prefetch" href="/assets/js/254.137c6595.js"><link rel="prefetch" href="/assets/js/255.ac6865dc.js"><link rel="prefetch" href="/assets/js/256.055e06fd.js"><link rel="prefetch" href="/assets/js/257.63559614.js"><link rel="prefetch" href="/assets/js/258.b6958ba1.js"><link rel="prefetch" href="/assets/js/259.bc6da491.js"><link rel="prefetch" href="/assets/js/26.77d42111.js"><link rel="prefetch" href="/assets/js/260.a8e9559d.js"><link rel="prefetch" href="/assets/js/261.b051c6dd.js"><link rel="prefetch" href="/assets/js/262.e83c7ca8.js"><link rel="prefetch" href="/assets/js/263.bd14a165.js"><link rel="prefetch" href="/assets/js/264.65c3b624.js"><link rel="prefetch" href="/assets/js/265.db4371b9.js"><link rel="prefetch" href="/assets/js/266.97118d6c.js"><link rel="prefetch" href="/assets/js/267.de83cb0b.js"><link rel="prefetch" href="/assets/js/268.2bdd86cb.js"><link rel="prefetch" href="/assets/js/269.9c9a802f.js"><link rel="prefetch" href="/assets/js/27.fa37605f.js"><link rel="prefetch" href="/assets/js/270.f599f9fe.js"><link rel="prefetch" href="/assets/js/271.275d4619.js"><link rel="prefetch" href="/assets/js/272.ed0fabf6.js"><link rel="prefetch" href="/assets/js/273.fc279fbe.js"><link rel="prefetch" href="/assets/js/274.fe4b3d21.js"><link rel="prefetch" href="/assets/js/275.922677e1.js"><link rel="prefetch" href="/assets/js/276.597ceb81.js"><link rel="prefetch" href="/assets/js/277.71871d2e.js"><link rel="prefetch" href="/assets/js/278.10923657.js"><link rel="prefetch" href="/assets/js/279.cddbf2d7.js"><link rel="prefetch" href="/assets/js/28.7418a003.js"><link rel="prefetch" href="/assets/js/280.66542c64.js"><link rel="prefetch" href="/assets/js/281.c7ca5292.js"><link rel="prefetch" href="/assets/js/282.d105ef08.js"><link rel="prefetch" href="/assets/js/283.ae8d69c7.js"><link rel="prefetch" href="/assets/js/284.8763c337.js"><link rel="prefetch" href="/assets/js/285.cce4e007.js"><link rel="prefetch" href="/assets/js/29.42b5bf54.js"><link rel="prefetch" href="/assets/js/3.a2af090e.js"><link rel="prefetch" href="/assets/js/30.7fe0ece5.js"><link rel="prefetch" href="/assets/js/31.e05d012e.js"><link rel="prefetch" href="/assets/js/32.0a6466c6.js"><link rel="prefetch" href="/assets/js/33.8db270b1.js"><link rel="prefetch" href="/assets/js/34.c6e6ae70.js"><link rel="prefetch" href="/assets/js/35.8fc12d56.js"><link rel="prefetch" href="/assets/js/36.cb54baf3.js"><link rel="prefetch" href="/assets/js/37.656cb8eb.js"><link rel="prefetch" href="/assets/js/38.9152ff6b.js"><link rel="prefetch" href="/assets/js/39.f71e5e3d.js"><link rel="prefetch" href="/assets/js/4.02de3c47.js"><link rel="prefetch" href="/assets/js/40.3d664ab4.js"><link rel="prefetch" href="/assets/js/41.fc6e4f78.js"><link rel="prefetch" href="/assets/js/42.c17c3353.js"><link rel="prefetch" href="/assets/js/43.e78a329f.js"><link rel="prefetch" href="/assets/js/44.326a0948.js"><link rel="prefetch" href="/assets/js/45.67e6e1d4.js"><link rel="prefetch" href="/assets/js/46.85f71b1e.js"><link rel="prefetch" href="/assets/js/47.f2e524a6.js"><link rel="prefetch" href="/assets/js/48.843108ee.js"><link rel="prefetch" href="/assets/js/49.98713c95.js"><link rel="prefetch" href="/assets/js/5.f38c3daa.js"><link rel="prefetch" href="/assets/js/50.2c70898f.js"><link rel="prefetch" href="/assets/js/51.023fea5d.js"><link rel="prefetch" href="/assets/js/52.3877af4c.js"><link rel="prefetch" href="/assets/js/53.3938d117.js"><link rel="prefetch" href="/assets/js/54.4cf45721.js"><link rel="prefetch" href="/assets/js/55.6894de94.js"><link rel="prefetch" href="/assets/js/56.48fd0f63.js"><link rel="prefetch" href="/assets/js/57.2c3b8155.js"><link rel="prefetch" href="/assets/js/58.fee976b4.js"><link rel="prefetch" href="/assets/js/59.d57c3ac9.js"><link rel="prefetch" href="/assets/js/6.a7d50f34.js"><link rel="prefetch" href="/assets/js/60.9954df49.js"><link rel="prefetch" href="/assets/js/61.1b870f60.js"><link rel="prefetch" href="/assets/js/62.37537ac3.js"><link rel="prefetch" href="/assets/js/63.5e7cfac8.js"><link rel="prefetch" href="/assets/js/64.407003ca.js"><link rel="prefetch" href="/assets/js/65.ba6c5d7d.js"><link rel="prefetch" href="/assets/js/66.2b5a751b.js"><link rel="prefetch" href="/assets/js/67.2faf15d0.js"><link rel="prefetch" href="/assets/js/68.19e50dcb.js"><link rel="prefetch" href="/assets/js/69.eec003cb.js"><link rel="prefetch" href="/assets/js/7.6c196c91.js"><link rel="prefetch" href="/assets/js/70.98d2461a.js"><link rel="prefetch" href="/assets/js/71.184225a4.js"><link rel="prefetch" href="/assets/js/72.956d136a.js"><link rel="prefetch" href="/assets/js/73.3e68378e.js"><link rel="prefetch" href="/assets/js/74.cec669e7.js"><link rel="prefetch" href="/assets/js/75.d418b5f0.js"><link rel="prefetch" href="/assets/js/76.f3f9ccd6.js"><link rel="prefetch" href="/assets/js/77.f24df03b.js"><link rel="prefetch" href="/assets/js/78.7eee67a8.js"><link rel="prefetch" href="/assets/js/79.8fadb3f7.js"><link rel="prefetch" href="/assets/js/8.b7eb2fb2.js"><link rel="prefetch" href="/assets/js/80.4f6165b0.js"><link rel="prefetch" href="/assets/js/81.49b03807.js"><link rel="prefetch" href="/assets/js/82.7ea07224.js"><link rel="prefetch" href="/assets/js/83.d6bd71b7.js"><link rel="prefetch" href="/assets/js/84.26db1aa8.js"><link rel="prefetch" href="/assets/js/85.c8f1f3bb.js"><link rel="prefetch" href="/assets/js/86.fd1c3c7f.js"><link rel="prefetch" href="/assets/js/87.38ab6ed9.js"><link rel="prefetch" href="/assets/js/88.f0a874e0.js"><link rel="prefetch" href="/assets/js/89.2b3352d4.js"><link rel="prefetch" href="/assets/js/9.d7ae4925.js"><link rel="prefetch" href="/assets/js/90.286cc7d4.js"><link rel="prefetch" href="/assets/js/91.c17c366b.js"><link rel="prefetch" href="/assets/js/92.29bc2389.js"><link rel="prefetch" href="/assets/js/93.6d335097.js"><link rel="prefetch" href="/assets/js/94.89ab26c7.js"><link rel="prefetch" href="/assets/js/95.f2493183.js"><link rel="prefetch" href="/assets/js/96.6662ec36.js"><link rel="prefetch" href="/assets/js/97.22c9d3f9.js"><link rel="prefetch" href="/assets/js/98.0b0b77a2.js"><link rel="prefetch" href="/assets/js/99.df5f5981.js">
    <link rel="stylesheet" href="/assets/css/0.styles.e02fc531.css">
  </head>
  <body>
    <div id="app" data-server-rendered="true"><div class="theme-container"><header class="navbar"><div class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div> <a href="/" class="home-link router-link-active"><img src="/images/logo.png" alt="前端档案" class="logo"> <span class="site-name can-hide">前端档案</span></a> <div class="links"><div class="search-box"><input aria-label="Search" autocomplete="off" spellcheck="false" value=""> <!----></div> <nav class="nav-links can-hide"><div class="nav-item"><a href="/guide/" class="nav-link">
  指南
</a></div><div class="nav-item"><a href="/fe/" class="nav-link router-link-active">
  前端
</a></div><div class="nav-item"><a href="/be/" class="nav-link">
  后端
</a></div><div class="nav-item"><a href="/base/" class="nav-link">
  基础
</a></div><div class="nav-item"><a href="/tools/" class="nav-link">
  工具
</a></div><div class="nav-item"><a href="/resume/" class="nav-link">
  简历
</a></div><div class="nav-item"><a href="/experience/" class="nav-link">
  面经
</a></div><div class="nav-item"><a href="/technology/" class="nav-link">
  八股文
</a></div><div class="nav-item"><a href="/thinks/" class="nav-link">
  思考
</a></div> <!----></nav></div></header> <div class="sidebar-mask"></div> <aside class="sidebar"><nav class="nav-links"><div class="nav-item"><a href="/guide/" class="nav-link">
  指南
</a></div><div class="nav-item"><a href="/fe/" class="nav-link router-link-active">
  前端
</a></div><div class="nav-item"><a href="/be/" class="nav-link">
  后端
</a></div><div class="nav-item"><a href="/base/" class="nav-link">
  基础
</a></div><div class="nav-item"><a href="/tools/" class="nav-link">
  工具
</a></div><div class="nav-item"><a href="/resume/" class="nav-link">
  简历
</a></div><div class="nav-item"><a href="/experience/" class="nav-link">
  面经
</a></div><div class="nav-item"><a href="/technology/" class="nav-link">
  八股文
</a></div><div class="nav-item"><a href="/thinks/" class="nav-link">
  思考
</a></div> <!----></nav>  <ul class="sidebar-links"><li><a href="/fe/" aria-current="page" class="sidebar-link">大前端学习路径 + B站资源整合</a></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>HTML</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>CSS</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>JavaScript</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>TypeScript</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ES6</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Vue</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/fe/vue/" aria-current="page" class="sidebar-link">Vue的理解</a></li><li><a href="/fe/vue/mvvm.html" class="sidebar-link">MVVM 双向数据绑定</a></li><li><a href="/fe/vue/spa.html" class="sidebar-link">面试官：你对SPA单页面的理解，它的优缺点分别是什么？如何实现SPA应用呢</a></li><li><a href="/fe/vue/show_if.html" class="sidebar-link">v-show 和 v-if 有什么区别？</a></li><li><a href="/fe/vue/new_vue.html" class="sidebar-link">面试官：Vue实例挂载的过程</a></li><li><a href="/fe/vue/lifecycle.html" class="sidebar-link">面试官：请描述下你对vue生命周期的理解？在created和mounted这两个生命周期中请求数据有什么区别呢？</a></li><li><a href="/fe/vue/if_for.html" class="sidebar-link">面试官：v-if和v-for的优先级是什么？</a></li><li><a href="/fe/vue/computed_watch.html" class="sidebar-link">计算属性 VS 监听属性</a></li><li><a href="/fe/vue/first_page_time.html" class="sidebar-link">面试官：SPA首屏加载速度慢的怎么解决？</a></li><li><a href="/fe/vue/data.html" class="sidebar-link">面试官：为什么data属性是一个函数而不是一个对象？</a></li><li><a href="/fe/vue/data_object_add_attrs.html" class="sidebar-link">面试官：动态给vue的data添加一个新的属性时会发生什么？怎样解决？</a></li><li><a href="/fe/vue/components_plugin.html" class="sidebar-link">面试官：Vue中组件和插件有什么区别？</a></li><li><a href="/fe/vue/communication.html" class="sidebar-link">面试官：Vue组件之间的通信方式都有哪些？</a></li><li><a href="/fe/vue/nexttick.html" class="sidebar-link">面试官：Vue中的$nextTick有什么作用？</a></li><li><a href="/fe/vue/mixin.html" class="sidebar-link">Mixin 混入</a></li><li><a href="/fe/vue/slot.html" aria-current="page" class="active sidebar-link">面试官：说说你对slot的理解？slot使用场景有哪些？</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/fe/vue/slot.html#一、slot是什么" class="sidebar-link">一、slot是什么</a></li><li class="sidebar-sub-header"><a href="/fe/vue/slot.html#二、使用场景" class="sidebar-link">二、使用场景</a></li><li class="sidebar-sub-header"><a href="/fe/vue/slot.html#三、分类" class="sidebar-link">三、分类</a></li><li class="sidebar-sub-header"><a href="/fe/vue/slot.html#四、原理分析" class="sidebar-link">四、原理分析</a></li><li class="sidebar-sub-header"><a href="/fe/vue/slot.html#参考文献" class="sidebar-link">参考文献</a></li></ul></li><li><a href="/fe/vue/observable.html" class="sidebar-link">面试官：Vue.observable你有了解过吗？说说看</a></li><li><a href="/fe/vue/key.html" class="sidebar-link">Key的理解</a></li><li><a href="/fe/vue/keepalive.html" class="sidebar-link">面试官：说说你对keep-alive的理解是什么？</a></li><li><a href="/fe/vue/modifier.html" class="sidebar-link">面试官：Vue常用的修饰符有哪些有什么应用场景</a></li><li><a href="/fe/vue/directive.html" class="sidebar-link">面试官：你有写过自定义指令吗？自定义指令的应用场景有哪些？</a></li><li><a href="/fe/vue/filter.html" class="sidebar-link">面试官：Vue中的过滤器了解吗？过滤器的应用场景有哪些？</a></li><li><a href="/fe/vue/vnode.html" class="sidebar-link">虚拟DOM</a></li><li><a href="/fe/vue/diff.html" class="sidebar-link">Diff 算法</a></li><li><a href="/fe/vue/axios.html" class="sidebar-link">面试官：Vue项目中有封装过axios吗？主要是封装哪方面的？</a></li><li><a href="/fe/vue/axios_code.html" class="sidebar-link">面试官：你了解axios的原理吗？有看过它的源码吗？</a></li><li><a href="/fe/vue/ssr.html" class="sidebar-link">面试官：SSR解决了什么问题？有做过SSR吗？你是怎么做的？</a></li><li><a href="/fe/vue/structure.html" class="sidebar-link">面试官：说下你的vue项目的目录结构，如果是大型项目你该怎么划分结构和划分组件呢？</a></li><li><a href="/fe/vue/permission.html" class="sidebar-link">面试官：vue要做权限管理该怎么做？如果控制到按钮级别的权限怎么做？</a></li><li><a href="/fe/vue/cors.html" class="sidebar-link">面试官：Vue项目中你是如何解决跨域的呢？</a></li><li><a href="/fe/vue/404.html" class="sidebar-link">面试官：vue项目本地开发完成后部署到服务器后报404是什么原因呢？</a></li><li><a href="/fe/vue/error.html" class="sidebar-link">面试官：你是怎么处理vue项目中的错误的？</a></li><li><a href="/fe/vue/vue_router.html" class="sidebar-link">Vue Router</a></li><li><a href="/fe/vue/vue-debounce-throttle.html" class="sidebar-link">vue防抖调研</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Vue3</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>React</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Webpack</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Node.js</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>性能优化</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>手写代码</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="面试官-说说你对slot的理解-slot使用场景有哪些"><a href="#面试官-说说你对slot的理解-slot使用场景有哪些" class="header-anchor">#</a> 面试官：说说你对slot的理解？slot使用场景有哪些？</h1> <p><img src="https://static.vue-js.com/141ca660-3dbc-11eb-85f6-6fac77c0c9b3.png" alt=""></p> <h2 id="一、slot是什么"><a href="#一、slot是什么" class="header-anchor">#</a> 一、slot是什么</h2> <p>在HTML中 <code>slot</code> 元素 ，作为 <code>Web Components</code> 技术套件的一部分，是Web组件内的一个占位符</p> <p>该占位符可以在后期使用自己的标记语言填充</p> <p>举个栗子</p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>template</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>element-details-template<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>slot</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>element-name<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>Slot template<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>slot</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>template</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>element-details</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>span</span> <span class="token attr-name">slot</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>element-name<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>1<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>span</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>element-details</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>element-details</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>span</span> <span class="token attr-name">slot</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>element-name<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>2<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>span</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>element-details</span><span class="token punctuation">&gt;</span></span>
</code></pre></div><p><code>template</code>不会展示到页面中，需要用先获取它的引用，然后添加到<code>DOM</code>中，</p> <div class="language-js extra-class"><pre class="language-js"><code>customElements<span class="token punctuation">.</span><span class="token function">define</span><span class="token punctuation">(</span><span class="token string">'element-details'</span><span class="token punctuation">,</span>
  <span class="token keyword">class</span> <span class="token class-name">extends</span> HTMLElement <span class="token punctuation">{</span>
    <span class="token function">constructor</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">super</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">const</span> template <span class="token operator">=</span> document
        <span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'element-details-template'</span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span>content<span class="token punctuation">;</span>
      <span class="token keyword">const</span> shadowRoot <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">attachShadow</span><span class="token punctuation">(</span><span class="token punctuation">{</span>mode<span class="token operator">:</span> <span class="token string">'open'</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">appendChild</span><span class="token punctuation">(</span>template<span class="token punctuation">.</span><span class="token function">cloneNode</span><span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre></div><p>在<code>Vue</code>中的概念也是如此</p> <p><code>Slot</code> 艺名插槽，花名“占坑”，我们可以理解为<code>solt</code>在组件模板中占好了位置，当使用该组件标签时候，组件标签里面的内容就会自动填坑（替换组件模板中<code>slot</code>位置），作为承载分发内容的出口</p> <p>可以将其类比为插卡式的FC游戏机，游戏机暴露卡槽（插槽）让用户插入不同的游戏磁条（自定义内容）</p> <p>放张图感受一下
<img src="https://static.vue-js.com/63c0dff0-3dbd-11eb-85f6-6fac77c0c9b3.png" alt=""></p> <h2 id="二、使用场景"><a href="#二、使用场景" class="header-anchor">#</a> 二、使用场景</h2> <p>通过插槽可以让用户可以拓展组件，去更好地复用组件和对其做定制化处理</p> <p>如果父组件在使用到一个复用组件的时候，获取这个组件在不同的地方有少量的更改，如果去重写组件是一件不明智的事情</p> <p>通过<code>slot</code>插槽向组件内部指定位置传递内容，完成这个复用组件在不同场景的应用</p> <p>比如布局组件、表格列、下拉选、弹框显示内容等</p> <h2 id="三、分类"><a href="#三、分类" class="header-anchor">#</a> 三、分类</h2> <p><code>slot</code>可以分来以下三种：</p> <ul><li>默认插槽</li> <li>具名插槽</li> <li>作用域插槽</li></ul> <h3 id="默认插槽"><a href="#默认插槽" class="header-anchor">#</a> 默认插槽</h3> <p>子组件用<code>&lt;slot&gt;</code>标签来确定渲染的位置，标签里面可以放<code>DOM</code>结构，当父组件使用的时候没有往插槽传入内容，标签内<code>DOM</code>结构就会显示在页面</p> <p>父组件在使用的时候，直接在子组件的标签内写入内容即可</p> <p>子组件<code>Child.vue</code></p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>template</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>slot</span><span class="token punctuation">&gt;</span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span><span class="token punctuation">&gt;</span></span>插槽后备的内容<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>slot</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>template</span><span class="token punctuation">&gt;</span></span>
</code></pre></div><p>父组件</p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>Child</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span>默认插槽<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>  
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>Child</span><span class="token punctuation">&gt;</span></span>
</code></pre></div><h3 id="具名插槽"><a href="#具名插槽" class="header-anchor">#</a> 具名插槽</h3> <p>子组件用<code>name</code>属性来表示插槽的名字，不传为默认插槽</p> <p>父组件中在使用时在默认插槽的基础上加上<code>slot</code>属性，值为子组件插槽<code>name</code>属性值</p> <p>子组件<code>Child.vue</code></p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>template</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>slot</span><span class="token punctuation">&gt;</span></span>插槽后备的内容<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>slot</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>slot</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>content<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>插槽后备的内容<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>slot</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>template</span><span class="token punctuation">&gt;</span></span>
</code></pre></div><p>父组件</p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>child</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>template</span> <span class="token attr-name"><span class="token namespace">v-slot:</span>default</span><span class="token punctuation">&gt;</span></span>具名插槽<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>template</span><span class="token punctuation">&gt;</span></span>
    <span class="token comment">&lt;!-- 具名插槽⽤插槽名做参数 --&gt;</span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>template</span> <span class="token attr-name"><span class="token namespace">v-slot:</span>content</span><span class="token punctuation">&gt;</span></span>内容...<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>template</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>child</span><span class="token punctuation">&gt;</span></span>
</code></pre></div><h3 id="作用域插槽"><a href="#作用域插槽" class="header-anchor">#</a> 作用域插槽</h3> <p>子组件在作用域上绑定属性来将子组件的信息传给父组件使用，这些属性会被挂在父组件<code>v-slot</code>接受的对象上</p> <p>父组件中在使用时通过<code>v-slot:</code>（简写：#）获取子组件的信息，在内容中使用</p> <p>子组件<code>Child.vue</code></p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>template</span><span class="token punctuation">&gt;</span></span> 
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>slot</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>footer<span class="token punctuation">&quot;</span></span> <span class="token attr-name">testProps</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>子组件的值<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
          <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h3</span><span class="token punctuation">&gt;</span></span>没传footer插槽<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h3</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>slot</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>template</span><span class="token punctuation">&gt;</span></span>
</code></pre></div><p>父组件</p> <div class="language-html extra-class"><pre class="language-html"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>child</span><span class="token punctuation">&gt;</span></span> 
    <span class="token comment">&lt;!-- 把v-slot的值指定为作⽤域上下⽂对象 --&gt;</span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>template</span> <span class="token attr-name"><span class="token namespace">v-slot:</span>default</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>slotProps<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
      来⾃⼦组件数据：{{slotProps.testProps}}
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>template</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>template</span> <span class="token attr-name">#default</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>slotProps<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
      来⾃⼦组件数据：{{slotProps.testProps}}
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>template</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>child</span><span class="token punctuation">&gt;</span></span>
</code></pre></div><h3 id="小结"><a href="#小结" class="header-anchor">#</a> 小结：</h3> <ul><li><code>v-slot</code>属性只能在<code>&lt;template&gt;</code>上使用，但在只有默认插槽时可以在组件标签上使用</li> <li>默认插槽名为<code>default</code>，可以省略default直接写<code>v-slot</code></li> <li>缩写为<code>#</code>时不能不写参数，写成<code>#default</code></li> <li>可以通过解构获取<code>v-slot={user}</code>，还可以重命名<code>v-slot=&quot;{user: newName}&quot;</code>和定义默认值<code>v-slot=&quot;{user = '默认值'}&quot;</code></li></ul> <h2 id="四、原理分析"><a href="#四、原理分析" class="header-anchor">#</a> 四、原理分析</h2> <p><code>slot</code>本质上是返回<code>VNode</code>的函数，一般情况下，<code>Vue</code>中的组件要渲染到页面上需要经过<code>template -&gt; render function -&gt; VNode -&gt; DOM</code> 过程，这里看看<code>slot</code>如何实现：</p> <p>编写一个<code>buttonCounter</code>组件，使用匿名插槽</p> <div class="language-js extra-class"><pre class="language-js"><code>Vue<span class="token punctuation">.</span><span class="token function">component</span><span class="token punctuation">(</span><span class="token string">'button-counter'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
  template<span class="token operator">:</span> <span class="token string">'&lt;div&gt; &lt;slot&gt;我是默认内容&lt;/slot&gt;&lt;/div&gt;'</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre></div><p>使用该组件</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">new</span> <span class="token class-name">Vue</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    el<span class="token operator">:</span> <span class="token string">'#app'</span><span class="token punctuation">,</span>
    template<span class="token operator">:</span> <span class="token string">'&lt;button-counter&gt;&lt;span&gt;我是slot传入内容&lt;/span&gt;&lt;/button-counter&gt;'</span><span class="token punctuation">,</span>
    components<span class="token operator">:</span><span class="token punctuation">{</span>buttonCounter<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre></div><p>获取<code>buttonCounter</code>组件渲染函数</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token punctuation">(</span><span class="token keyword">function</span> <span class="token function">anonymous</span><span class="token punctuation">(</span>
<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">with</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">{</span><span class="token keyword">return</span> <span class="token function">_c</span><span class="token punctuation">(</span><span class="token string">'div'</span><span class="token punctuation">,</span><span class="token punctuation">[</span><span class="token function">_t</span><span class="token punctuation">(</span><span class="token string">&quot;default&quot;</span><span class="token punctuation">,</span><span class="token punctuation">[</span><span class="token function">_v</span><span class="token punctuation">(</span><span class="token string">&quot;我是默认内容&quot;</span><span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">]</span><span class="token punctuation">,</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre></div><p><code>_v</code>表示穿件普通文本节点，<code>_t</code>表示渲染插槽的函数</p> <p>渲染插槽函数<code>renderSlot</code>（做了简化）</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">function</span> <span class="token function">renderSlot</span> <span class="token punctuation">(</span>
  <span class="token parameter">name<span class="token punctuation">,</span>
  fallback<span class="token punctuation">,</span>
  props<span class="token punctuation">,</span>
  bindObject</span>
<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token comment">// 得到渲染插槽内容的函数    </span>
  <span class="token keyword">var</span> scopedSlotFn <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>$scopedSlots<span class="token punctuation">[</span>name<span class="token punctuation">]</span><span class="token punctuation">;</span>
  <span class="token keyword">var</span> nodes<span class="token punctuation">;</span>
  <span class="token comment">// 如果存在插槽渲染函数，则执行插槽渲染函数，生成nodes节点返回</span>
  <span class="token comment">// 否则使用默认值</span>
  nodes <span class="token operator">=</span> <span class="token function">scopedSlotFn</span><span class="token punctuation">(</span>props<span class="token punctuation">)</span> <span class="token operator">||</span> fallback<span class="token punctuation">;</span>
  <span class="token keyword">return</span> nodes<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p><code>name</code>属性表示定义插槽的名字，默认值为<code>default</code>，<code>fallback</code>表示子组件中的<code>slot</code>节点的默认值</p> <p>关于<code>this.$scopredSlots</code>是什么，我们可以先看看<code>vm.slot</code></p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">function</span> <span class="token function">initRender</span> <span class="token punctuation">(</span><span class="token parameter">vm</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token operator">...</span>
  vm<span class="token punctuation">.</span>$slots <span class="token operator">=</span> <span class="token function">resolveSlots</span><span class="token punctuation">(</span>options<span class="token punctuation">.</span>_renderChildren<span class="token punctuation">,</span> renderContext<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token operator">...</span>
<span class="token punctuation">}</span>
</code></pre></div><p><code>resolveSlots</code>函数会对<code>children</code>节点做归类和过滤处理，返回<code>slots</code></p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">function</span> <span class="token function">resolveSlots</span> <span class="token punctuation">(</span>
    <span class="token parameter">children<span class="token punctuation">,</span>
    context</span>
  <span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>children <span class="token operator">||</span> <span class="token operator">!</span>children<span class="token punctuation">.</span>length<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">return</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">var</span> slots <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">,</span> l <span class="token operator">=</span> children<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i <span class="token operator">&lt;</span> l<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">var</span> child <span class="token operator">=</span> children<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">;</span>
      <span class="token keyword">var</span> data <span class="token operator">=</span> child<span class="token punctuation">.</span>data<span class="token punctuation">;</span>
      <span class="token comment">// remove slot attribute if the node is resolved as a Vue slot node</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>data <span class="token operator">&amp;&amp;</span> data<span class="token punctuation">.</span>attrs <span class="token operator">&amp;&amp;</span> data<span class="token punctuation">.</span>attrs<span class="token punctuation">.</span>slot<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">delete</span> data<span class="token punctuation">.</span>attrs<span class="token punctuation">.</span>slot<span class="token punctuation">;</span>
      <span class="token punctuation">}</span>
      <span class="token comment">// named slots should only be respected if the vnode was rendered in the</span>
      <span class="token comment">// same context.</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>child<span class="token punctuation">.</span>context <span class="token operator">===</span> context <span class="token operator">||</span> child<span class="token punctuation">.</span>fnContext <span class="token operator">===</span> context<span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span>
        data <span class="token operator">&amp;&amp;</span> data<span class="token punctuation">.</span>slot <span class="token operator">!=</span> <span class="token keyword">null</span>
      <span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token comment">// 如果slot存在(slot=&quot;header&quot;) 则拿对应的值作为key</span>
        <span class="token keyword">var</span> name <span class="token operator">=</span> data<span class="token punctuation">.</span>slot<span class="token punctuation">;</span>
        <span class="token keyword">var</span> slot <span class="token operator">=</span> <span class="token punctuation">(</span>slots<span class="token punctuation">[</span>name<span class="token punctuation">]</span> <span class="token operator">||</span> <span class="token punctuation">(</span>slots<span class="token punctuation">[</span>name<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">// 如果是tempalte元素 则把template的children添加进数组中，这也就是为什么你写的template标签并不会渲染成另一个标签到页面</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>child<span class="token punctuation">.</span>tag <span class="token operator">===</span> <span class="token string">'template'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
          slot<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">.</span><span class="token function">apply</span><span class="token punctuation">(</span>slot<span class="token punctuation">,</span> child<span class="token punctuation">.</span>children <span class="token operator">||</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
          slot<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>child<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
      <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
        <span class="token comment">// 如果没有就默认是default</span>
        <span class="token punctuation">(</span>slots<span class="token punctuation">.</span>default <span class="token operator">||</span> <span class="token punctuation">(</span>slots<span class="token punctuation">.</span>default <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>child<span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    <span class="token comment">// ignore slots that contains only whitespace</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> name$<span class="token number">1</span> <span class="token keyword">in</span> slots<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>slots<span class="token punctuation">[</span>name$<span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">every</span><span class="token punctuation">(</span>isWhitespace<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">delete</span> slots<span class="token punctuation">[</span>name$<span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">return</span> slots
<span class="token punctuation">}</span>
</code></pre></div><p><code>_render</code>渲染函数通过<code>normalizeScopedSlots</code>得到<code>vm.$scopedSlots</code></p> <div class="language-js extra-class"><pre class="language-js"><code>vm<span class="token punctuation">.</span>$scopedSlots <span class="token operator">=</span> <span class="token function">normalizeScopedSlots</span><span class="token punctuation">(</span>
  _parentVnode<span class="token punctuation">.</span>data<span class="token punctuation">.</span>scopedSlots<span class="token punctuation">,</span>
  vm<span class="token punctuation">.</span>$slots<span class="token punctuation">,</span>
  vm<span class="token punctuation">.</span>$scopedSlots
<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><p>作用域插槽中父组件能够得到子组件的值是因为在<code>renderSlot</code>的时候执行会传入<code>props</code>，也就是上述<code>_t</code>第三个参数，父组件则能够得到子组件传递过来的值</p> <h2 id="参考文献"><a href="#参考文献" class="header-anchor">#</a> 参考文献</h2> <ul><li>https://juejin.cn/post/6844903817746628615#heading-4</li> <li>https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_templates_and_slots</li> <li>https://vue3js.cn/docs/zh</li> <li>https://segmentfault.com/a/1190000019492734?utm_source=tag-newest</li></ul></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">更新时间:</span> <span class="time">12/14/2021, 10:12:35 AM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
      ←
      <a href="/fe/vue/mixin.html" class="prev">
        Mixin 混入
      </a></span> <span class="next"><a href="/fe/vue/observable.html">
        面试官：Vue.observable你有了解过吗？说说看
      </a>
      →
    </span></p></div> </main></div><div class="global-ui"><!----></div></div>
    <script src="/assets/js/app.bf44e39b.js" defer></script><script src="/assets/js/2.db7a59af.js" defer></script><script src="/assets/js/232.42df48c8.js" defer></script>
  </body>
</html>
